Apparatus for the detection of faults in cups, glasses or the like
US4429998A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1981 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | Sep 17, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Improved apparatus is provided for use in detecting faults, such as cracks, "flashes," "short shots" and "grease" deposits, during the quality control inspection phase of the production of molded articles, such as cups, glasses, containers, lids or the like, especially those formed by injection molding from plastic material. The apparatus employs optical sensing and electrical signal handling techniques involving sensors for providing electrical signals (or signal controlling parameters) corresponding to the intensity of light transmitted through or/and reflected from an article being inspected, in conjunction with electrical, fault detection circuitry that responds equally well and produces a fault indicating, electrical output of like polarity for greater than threshold magnitude changes in either direction (decrease or increase) in the intensity of the light being sensed. The apparatus includes sensors permitting the detection of faults in either transparent or opaque articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.